I think it is not completely a good opportunity to buy at certain low prices because the market is down. The crypto market can be funny at times, and buying at a low might not be an opportunity, i looked at it as a choice.
Now, for instance, those that bought bitcoin at just $6000 did so because they thought that the price was low, and they actually considered it low, but i think it wasn't an opportunity, but a choice to buy at that time.
In a nutshell, i personally think that prices become low based on individuals purchasing power, that is, your ability to buy at any point in time irrespective of price movement because prices can swing to any direction.